Drake,
" So am I understanding that the present direction of maximizing the evenness and efficiency of the floor loops is minimizing the tube spacing? " YES
"In other words in my case could I use 5/8 ID pex as if it was 1/2 in a 8-9" spacing if I can work out the return bends(which I can do as I have room to mushroom out 180's to 12" if needed) in a goal to do low temp heating in a high mass slab(which will be very well insulated)?" YES
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